One-piece buckle



FIG. 1 is a perspective view of a one-piece buckle embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front-side view thereof;

FIG. 4 is a lateral-side view thereof;

FIG. 5 is another lateral side view thereof;

FIG. 6 is a rear-side view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a cross-sectional view thereof taken along the line 8--8 in FIG. 2. 

The ornamental design for a one-piece buckle, as shown and described. 